javascript.js

var Thing;
var __hasProp = Object.prototype.hasOwnProperty, __extends = function(child, parent) {
  for (var key in parent) { if (__hasProp.call(parent, key)) child[key] = parent[key]; }
  function ctor() { this.constructor = child; }
  ctor.prototype = parent.prototype;
  child.prototype = new ctor;
  child.__super__ = parent.prototype;
  return child;
};
Thing = (function() {
  __extends(Thing, EventEmitter);
  function Thing(name) { //this constructor function is the scope of `name`
    this.getName = function() { //but `this` is what the constructor returns, so this method is public
      return name;
    };
  }
  return Thing;
})();

original.coffee

class Thing extends EventEmitter
  constructor: (name) ->
    @getName = -> name